experiment - n. a test or trial carried out to prove if an idea is true or false, or to discover something

test - v. to attempt to learn or prove what something is like or how it will act by studying or doing; n. an attempt to learn or prove what something is like or how it will act by studying or doing; a group of questions or problems used to find out a person’s knowledge

extend - v. to stretch out in area or length; to continue for a longer time

infected - v. to make sick with something that causes disease